barr marine exhaust products

My boat is 48 years old and it been 30 years since I last had it overhauled. I was a commercial gillnet fisherman in Oregon. But laws have changed and it's really hard to say you make money. However I had some exhaust parts that finally wore down. I looked on the internet and found the same parts that I installed 48 years ago. Contacted Barr marine and they still make the same parts. Should I change engines , maybe but it the olds 455 has served me well and the parts are still there so we will rebuild.